1.4Audio Selector (All models)

Receiver audio is selected through seven momentary, push-button, backlit switches. You will always hear the audio from the transceiver that is selected for transmit.

The users can identify which receivers are selected by noting which of the green switch LEDs are illuminated. Push buttons labeled Nav 1, Nav 2, MKR (Marker), AUX (auxiliary), and SPR (Speaker) are "momentary type switches. When one of

these buttons is pressed, be active, and the LED will illuminate. Press the switch again and it will be in the "off" position and remove that receiver from the audio.

If the aircraft is equipped with a DME or ADF, these audio sources can be selected with the AUX button.

1.4.1Speaker Amplifier

The "SPR" in the push-button section stands for speaker. This switch will place all selected audio on the cockpit speaker when this switch is selected. NOTE: Except for the unswitched audio, the speaker amplifier is not active in the "Split Mode."

Unswitched audio, (autopilot disconnect, altimeter warning, etc.) will come through the speaker regardless of the speaker button position.

1.4.1.1Public Address Function

To access PA function, an external switch must be installed, and activated. This places the pilot microphone on the speaker output when the PTT is pushed. The copilot can continue to use the selected com radio.

We recommend that the switch transfer the audio from the cockpit speaker to a cabin speaker for public address. This will prevent feedback.

1.4.2Key “Click”

The SL15-CD is equipped with a “click” function that provides an aural feedback to the user in addition to the tactile button push. This sound can be enabled or disabled by simultaneously holding the COM 1 and COM 2 buttons in for at least 5 seconds. Any person hearing the radios will also hear the key click.

Allow at least 20 seconds between turning the key click on and off.

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